Sporting Team GB clothes, Catherine, Duchess of Cambridge walks in the boat park on Day 10 of the London 2012 Olympic Games at the Weymouth & Portland Venue at Weymouth Harbour on August 6, 2012 in Weymouth, England.

We asked an Olympian what it's like to spend 4 years training for Rio -> http://mashable.com/2016/08/04/team-gb-olympics-training/ LONDON The countdown until the official opening of the Rio 2016 Olympics is officially on. First-time Olympians are gearing up for the most exciting and career-defining games of their lives so far. SEE ALSO: Female Olympians pose naked in tribute to the bodies that helped them achieve their goals But the Olympic journey didn't begin here for most Olympians…